:root {
  --bg: #f4f6f8;
  --panel: #ffffff;
  --border: #d4dde6;
  --text-main: #1f2933;
  --text-muted: #4b5563;
  --text-soft: #6b7280;
  --accent: #46576b;
  --shadow: 0 10px 30px rgba(15, 23, 42, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111315;
    --panel: #1a1d1f;
    --border: #2a2d31;
    --text-main: #e5e7eb;
    --text-muted: #cbd5d1;
    --text-soft: #9ca3af;
    --accent: #46576b;
    --shadow: 0 18px 35px rgba(0, 0, 0, 0.45);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text-main);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

header {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.nav-logo { height: 52px; width: auto; }
.nav-logo-link { display: flex; align-items: center; }
.nav-logo-link:hover { text-decoration: none; }

nav { display: flex; align-items: center; gap: 0.25rem; }
nav a {
  padding: 0.5rem 0.9rem;
  border-radius: 6px;
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: background 0.15s, color 0.15s;
}
nav a:hover {
  background: var(--border);
  color: var(--text-main);
  text-decoration: none;
}
nav a.active { background: var(--accent); color: #fff; }

@media (max-width: 700px) {
  .header-inner { flex-wrap: wrap; }
  nav { width: 100%; justify-content: center; flex-wrap: wrap; }
  nav a { padding: 0.4rem 0.7rem; font-size: 0.85rem; }
}

main { flex: 1; }

.hero {
  max-width: 900px;
  margin: 0 auto;
  padding: 3.5rem 1.5rem 4rem;
  text-align: center;
}

.hero-tagline {
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 0.75rem;
  color: var(--text-soft);
  margin-bottom: 0.75rem;
}

.hero-title {
  font-size: clamp(2.1rem, 3.4vw, 2.8rem);
  font-weight: 800;
  color: var(--accent);
  line-height: 1.15;
  margin-bottom: 1rem;
}

.hero-subtitle {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-muted);
  margin: 0 auto 2rem;
  max-width: 36rem;
}

.content-page {
  max-width: 800px;
  margin: 0 auto;
  padding: 2.5rem 1.5rem 4rem;
}
.content-page h1 {
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.5rem;
}
.content-page .last-updated {
  font-size: 0.85rem;
  color: var(--text-soft);
  margin-bottom: 2rem;
}
.content-page h2 {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 2rem 0 0.75rem;
}
.content-page h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 1.5rem 0 0.5rem;
}
.content-page p {
  line-height: 1.7;
  color: var(--text-muted);
  margin-bottom: 1rem;
}
.content-page ul, .content-page ol {
  margin: 0 0 1rem 1.5rem;
  color: var(--text-muted);
  line-height: 1.7;
}
.content-page li { margin-bottom: 0.5rem; }
.content-page strong { color: var(--text-main); }

.ip-highlight {
  background: var(--panel);
  border: 2px solid var(--accent);
  border-radius: 8px;
  padding: 1.5rem;
  text-align: center;
  margin: 2rem 0;
}
.ip-highlight .ip-label {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-soft);
  margin-bottom: 0.5rem;
}
.ip-highlight .ip-address {
  font-size: 1.8rem;
  font-weight: 700;
  font-family: ui-monospace, "SF Mono", Menlo, Monaco, monospace;
  color: var(--accent);
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}
.feature-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.5rem;
}
.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
  margin: 0 0 0.75rem;
}
.feature-card p {
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text-muted);
  margin: 0;
}

/* Contact page */
.contact-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}
.contact-card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 1.75rem;
  text-align: center;
  transition: border-color 0.15s, box-shadow 0.15s;
}
.contact-card:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow);
}
.contact-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-main);
  margin: 0 0 0.5rem;
}
.contact-card p {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text-muted);
  margin: 0 0 1rem;
}
.contact-card .mailto-btn {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: #fff;
  background: var(--accent);
  border-radius: 6px;
  transition: opacity 0.15s;
}
.contact-card .mailto-btn:hover {
  opacity: 0.9;
  text-decoration: none;
}

/* Policy toggle */
.policy-toggle {
  display: flex;
  gap: 0;
  margin: 2rem 0 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--panel);
}
.policy-toggle label {
  flex: 1;
  text-align: center;
  padding: 0.75rem 1rem;
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
  border-right: 1px solid var(--border);
  user-select: none;
}
.policy-toggle label:last-child { border-right: none; }
.policy-toggle input[type="radio"] { display: none; }
.policy-toggle input[type="radio"]:checked + label {
  background: var(--accent);
  color: #fff;
}
.policy-content { display: none; }
.policy-content.active { display: block; }

footer {
  border-top: 1px solid var(--border);
  padding: 1.5rem;
  font-size: 0.8rem;
  color: var(--text-soft);
  background: var(--panel);
  margin-top: 2rem;
}
.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.footer-row { display: flex; justify-content: space-between; gap: 1rem; flex-wrap: wrap; }
.footer-links { display: flex; gap: 0.5rem; flex-wrap: wrap; }
.footer-links a { color: var(--text-soft); }
.footer-links a:hover { color: var(--text-main); }
.footer-divider { color: var(--border); }
@media (max-width: 600px) {
  .footer-row { flex-direction: column; text-align: center; }
  .footer-links { justify-content: center; }
}